# SecondBrain > SecondBrain is the AI second brain app for iPhone, Android and the web. You speak once and it remembers: it turns your voice into organized notes, calendar events and follow-ups, and gives your AI assistants (ChatGPT, Claude, Claude Code, Gemini, Cursor) one shared long-term memory via the Model Context Protocol (MCP). Free to download; the shared memory layer is a Pro feature. Private by design: no analytics, no ads, no training on your data. ## Key facts - Category: AI memory and second brain app (productivity). - Platforms: iPhone (iOS), Android, and web app at app.secondbrainmemory.com. - Free to download and use; a Pro subscription unlocks the shared memory across AI assistants. - Markdown export (Pro, iPhone only): Settings, then Export all notes, produces a .zip with one .md file per note and your folder tree preserved. The files open in Obsidian, Notion, VS Code or any text editor with no plugin or importer. It is an on-demand export, not a live sync, and it is not available on Android or the web app. - Shared memory works with Claude, Claude Code, ChatGPT, Gemini and Cursor via MCP. - Deepest integration: a native Claude plugin (marketplace fed3c3sa/secondbrain-shared-memory). - Setup takes about two minutes: sign in with Apple or Google, no API keys. - Privacy: data stored in the EU (Supabase, Row-Level Security), never used to train models, deletable in one tap. - App Store rating: 5.0 out of 5 (July 2026). Released April 2026. - Maker: Federico Cesarini (github.com/fed3c3sa). - Context on cross-assistant memory: ChatGPT and Claude cannot read each other's memory, and neither offers an import button. The simplest route is to connect SecondBrain to ChatGPT and ask ChatGPT to save what it remembers into SecondBrain, then connect Claude to the same memory; copying by hand also works but goes stale. SecondBrain is a managed version of that memory. ## Common questions, short answers - Is SecondBrain free? Free to download and use on iPhone, Android and the web, with limits. A Pro subscription raises those limits and unlocks the shared memory layer that connects your AI assistants. You turn Pro on in the app. - Which assistants can share one memory? Claude, Claude Code, ChatGPT, Gemini and Cursor, over the Model Context Protocol (MCP). - How long does setup take? About two minutes. You sign in with Apple or Google, and there are no API keys to paste. - How do I connect Claude? In Claude: Settings, then Plugins, then "+", then Add marketplace; paste `fed3c3sa/secondbrain-shared-memory`; install the SecondBrain plugin; press Connect and sign in with Apple or Google. - Can I get my notes out? Yes. Export all notes from Settings as one .zip of .md files, one file per note, with your folder tree preserved. Pro, iPhone. It is an on-demand export, not a live sync. - Does it work with Obsidian? Yes. Unzip the export into an Obsidian vault and it opens as it is, with no plugin and no importer. Notion, VS Code and any text editor read the same files. - Where is my data stored? In the EU, on Supabase with Row-Level Security, isolated per user. No analytics, no ads, and it is never used to train models. You can delete it in one tap. - Managed or self-hosted? SecondBrain is the managed option, with voice capture built in. Self-hosted MCP memory servers exist and are compared honestly on the MCP memory server guide. - How is it different from ChatGPT's or Claude's built-in memory? Built-in memory belongs to one assistant and cannot be read by the others. SecondBrain is one memory that every connected assistant reads and writes. ## Site - [Home](https://secondbrainmemory.com/): What SecondBrain does: voice capture, automatic notes, calendar and follow-ups, and memory shared across every AI you use. - [How it works (video)](https://secondbrainmemory.com/#video): A 3-minute demo, "This AI has INFINITE Memory. Here's how to use it.", going from voice capture to structured note, recall by asking, and one memory shared across ChatGPT, Claude and Gemini. - [FAQ](https://secondbrainmemory.com/#faq): What a second brain app is, pricing, how shared memory works across ChatGPT and Claude, MCP, devices, privacy, data storage, and the Markdown export (how to get your notes out as .md files, and how to move them into Obsidian, Notion or VS Code). - [Markdown export](https://secondbrainmemory.com/#export): Export every note as Markdown from Settings, as .md files in a .zip, and open them in an Obsidian vault. Pro, iPhone. - [Privacy Policy](https://secondbrainmemory.com/#privacy): No analytics, no ads, no training; EU-hosted, isolated per user; delete anytime. - [Terms of Use](https://secondbrainmemory.com/#terms) - [Support](https://secondbrainmemory.com/#support) ## Guides - [How to share one memory between ChatGPT and Claude](https://secondbrainmemory.com/chatgpt-claude-shared-memory/): Why assistants cannot share memory natively and how to connect them to one shared memory over MCP in about two minutes. - [How to transfer ChatGPT memory to Claude](https://secondbrainmemory.com/transfer-chatgpt-memory-to-claude/): There is no import button. The manual move that works today, what actually transfers, and how to keep both assistants current afterwards. - [What is an MCP memory server?](https://secondbrainmemory.com/mcp-memory-server/): A plain-English guide to MCP memory servers, with the main managed and self-hosted options in 2026 compared. - [Voice-first second brain apps: the 2026 comparison](https://secondbrainmemory.com/voice-second-brain-apps/): An honest comparison of SecondBrain, Voicenotes, TellDone, Mem, Tana, Reflect, Notion and Obsidian. - [Memoria permanente per ChatGPT e Claude (in italiano)](https://secondbrainmemory.com/it/memoria-ai/): La guida italiana alla memoria AI condivisa via MCP. ## Connect to an AI assistant - Claude: add the marketplace `fed3c3sa/secondbrain-shared-memory`, install the SecondBrain plugin, then Connect and sign in with Apple or Google. - Claude Code: `claude plugin marketplace add fed3c3sa/secondbrain-shared-memory`, then `claude plugin install secondbrain@secondbrain --scope user`, then `npx secondbrain-connect` and sign in. Verify with `claude mcp get secondbrain`. - Codex and ChatGPT Work: the same marketplace Claude uses. Plugins → Add → Add marketplace → `fed3c3sa/secondbrain-shared-memory`, install SecondBrain Memory, then type "connect to my SecondBrain" in the chat and sign in with Apple or Google. From a terminal instead: `codex plugin marketplace add fed3c3sa/secondbrain-shared-memory`, `codex plugin add secondbrain@secondbrain`, `codex mcp login secondbrain`; verify `codex mcp list` shows `Auth: OAuth`. - The plain ChatGPT chat is a separate surface: it takes tools from connectors in the account, not from an installed plugin, so the marketplace does not reach it. On Plus and above, add it by hand on chatgpt.com: Settings → Security and login → Developer mode, then Plugins → "+" → paste `https://mcp.secondbrainmemory.com/mcp` under Connection. SecondBrain is being submitted to the ChatGPT plugin directory so it becomes a one-click install there too. - Gemini, Cursor: run `npx secondbrain-connect` once and sign in in the browser. - Note: the shared memory is a Pro feature; enable it in the app first. ## Links - [Web app](https://app.secondbrainmemory.com/) - [App Store (iOS)](https://apps.apple.com/us/app/secondbrain-ai-memory/id6762130376) - [Google Play (Android)](https://play.google.com/store/apps/details?id=app.secondbrain.android) - [Demo video (YouTube, 3:14)](https://www.youtube.com/watch?v=miiynvYCZf4) - [YouTube channel](https://www.youtube.com/@SecondBrain-AISmartMemory) - [GitHub: shared memory plugin and setup guide](https://github.com/fed3c3sa/secondbrain-shared-memory) - [llms-full.txt (full content for AI)](https://secondbrainmemory.com/llms-full.txt)